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Cl Ruprecht 98 (8,612 of 18,816)

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Cl Ruprecht 98

Cl Ruprecht 98, Cl VDBH 125, C 1155-642, Ocl 868, COCD 300

RA: 11h 58m 36s
Dec: −64° 33′ 30″

Con: Crux
Ch: MSA:1003, U2:450, SA:25

Ref: SIMBAD, DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 32m

Mag: B=7.29, V=7

Size: 14′
PA: ?

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Photos  (1)

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Published comments

Vogt. N. & Moffat, AFJ (1973)

Vogt. N. & Moffat, AFJ (1973), "Southern Open Star Clusters III." Astron.Astrophys.Suppl., 10, 135-193. [image, table]

d = 0.35kpc, earliest Sp = B9; 7' x 10'; 11 members studied.

Modern observations

Timo Karhula [amastro]

[amastro] Corrected coordinates of some anonymous, southern star clusters

Dear Astro Friends,

After the annular solar eclipse in Western Australia last February 16, I took advantage of viewing some southern anonymous star clusters. I found that some of them seem to have erroneous positions in Uranometria. My suggested revisions of them are based on visual impressions only, that is, I found more cluster-like objects at my positions rather than the given positions in Uranometria and Sky Catalogue 2000.0.

I also viewed some 90 of the brightest of the Magellanic star clusters with 20x100 binoculars. I also noticed that most of their positions given by MegaStar are in error by a few arcminutes, especially when the source is NGC2000. While the coordinates are erroneous, the precision of the coordinates in NGC2000 is also poor, only 1 arcminute. With the aid of my visual observations, MegaStar and ESO's Digitized Sky Survey, I measured improved positions of these star clusters. The accuracy of my coordinates are about 0'.5 but much better where I have connected a specific object to a 'star' or a 'non-star' in MegaStar.

A while ago when I was into the "CDS Service for astronomical Catalogues" (http://cdsweb.u-strasbg.fr/Cats.html) and searched for LMC, I found the "Cluster System of the LMC" by Kontizas et al 1990. Since this catalogue provides accurate (1950) coordinates for 1762 (!) star clusters in the Large Magellanic Cloud, I think my positional improvements are now unneccessary. If anyone is interested in my compilation, I could send you my list.

Here is the short list of southern 'anonymous', Non MC star clusters and a nebula, whose positions in SkyCat and Uranometria I believe are slightly wrong.

Object RA Decl Correction and notes

Gum23 8 59.0 -47 30.6 8' SW of SkyCat pos This appears to be the

brightest part of the nebula and is

identical with the 'non-star'

GSC8156:2360 in MegaStar. Observed with

a 44.5 cm reflector @100x without nebula

filters. Are there any more visual

observations of this object which is a

part of the huge Gum SNR?

Trumpler 13 10 23.8 -60 08 3'.5 S of Uranometria pos. MS is correct

which uses positions given by Lyngå.

Observed with 20x100 binoculars.

Collinder 223 10 30.4 -60 05 16' S of Urano pos. 20x100

Ruprecht 90 10 31.0 -58 27 13' S of Urano pos. 20x100

Ruprecht 98 11 58.8 -64 34 8' SES of Urano pos. 20x100

Stock 15 12 10.5 -59 29 28' E of Urano pos. 20x100

Collinder 275 13 35.4 -60 11 7' SE of Urano pos. 20x100

Can anyone confirm these coordinates?

I also saw three star clusters at 10h 23.9m -57d 44'.0, 10h 24.0m -57d 45'.5 and 10h 25.9m -57d 56'. The identification of these clusters has been confusing. Some sources say that these are NGC3247, Westerlund 1 or Westerlund 2? Westerlund is sometimes abbreviated with 'We' and misspelled as Westerland. Can someone clear this mess up?

Swedish astronomers have catalogued many southern Deep Sky Objects, as the names Collinder, Lyngå, Wallenquist, Loden, Bernes, Sandquist, Westerlund etc tell!

/Timo

------------------------------------------------------------------------

Timo Karhula "Amateur astronomers are * *

E-mail: atotika@ato.abb.se nocturnal creatures" * * *

ICBM: +59d52'13" +16d05'22"

----------------------------------------------------------- * *

Contemporary observations

Magda Streicher

2010 January 29

Location: Alldays

12-inch f/10 SCT (95x 218x)

A magnitude 5.4 star points the way 14 arc-minutes south to a faint slightly tri-angular grouping. The faint stars is standing out quite well against a busy star field, and consist of around a dozen magnitude 11-12 stars.

(no date)

Alldays (22.50S, 20.12E, 770m).

12-inch f/10 SCT (95x, 218x)

There are two groupings in a 52.8 arc minute field of view. The larger grouping is about 11arc minutes in an N to S direction. I found another smaller grouping about 7' to the west consist of 6 stars in a very busy star field. Small string of 4 stars very much north in the field of view.

Auke Slotegraaf

1994 February 2

1994 February 2, Die Boord, 11x80 tripod-mounted. Has a bright star to the northeast, which forms the tip of a triangular-shaped region of 8-9th mag and fainter stars. The cluster lies near the apex of the triangle, near the bright stars. Not sure if I saw any cluster members, since the area is rich in faint stars. The whole triangular grouping plus bright star make an attractive sight.

1994-02-16

1994-02-16, 00:30, Jonkershoek, 11x80's tripod mounted, dewing. Lies between a 7th mag star and a small gathering of stars. Appears as a nebulous patch, mottled but easy to spot.

2009 January 27

Sutherland (Huis Lana)

"Bertha" 12-inch f/4.8 Dobsonian (EP: 32mm, 25mm, 10mm, 6.3mm Plossls, 2x Barlow, 32mm Erfle)

Conditions: Clear, dark.

At the junction of Crux, Centaurus and Musca lies Ruprecht 98. Five bright and two-dozen secondary stars are shown at 120x, displaying a remarkable angular arrangement of members, both overall and in several short rows. Generally the cluster is shaped like a curved rectangle oriented NNE-SSW. Not impressive, but does look like something. Should be sketched, really. (20090127/28. MSA 1002)

Richard Ford

2013 March 9th, Saturday

Location:Perdeberg.

Time:9:53pm.

Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.

Instrument:12-inch Dobsonian.

The stars in this open cluster is slightly concentrated towards each other and that there are bright and faint stars being mixed together in this cluster.The south region is more concentrated which includes a 9th magnitude star,however a large stream of stars is curved over the northern region of this cluster being slightly spaced by a string of four bright stars with each of them having a fainter companion.This open cluster measures 19.5'x 16.2'.

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